Expandible valve obturator



oa. 28,1930. C. SCHMITZ 1,779,893

EXPANDIBLE VALVE -OBTURATOR Filed Nov. 28, 1927`v 2 Sheets-Sheet 1 Oct. 28, 1930.

c. SCHMITZ EXPANDBLE VALVE OBTURATOR 2 Sheets-Sheet 2 Filed Nov. 28, 1927 Patented Oct. 28, 1930 i -CHARLES SCHMITZ', or La LoUvinari,y BELGIUM 'nxPAunnaLnl vALvE oBTUBATon j ,Application ined November 28, yisma'seriai No. 235,249, and in Laxemturg August 5,1927.' f

rlhis invention rhas for its object, a valve adaptable to any piping used to convey either steam', gas or fluids, and its advantages lie in 'its being'tighter ythanV those o'flordinary 255 types, at'same time requiring less upkeep than Y 'no they dojand enabling the operator to easily Y"substitute a fresh rpacking V.to replace' that of the threaded spindle, subject tono stop# ping of the valve motion.' L The present valve comprises a body the inside! 'of which is exactly designedv like an ordinary valve, excepting the seat which, 'in the present, device, is replaced by a mere continuationl of Vthev vcylindrical canal which v ft-5 serves forl sliding of the actual valve member :this latter has theshape of a pistonlone v part ofwhich is expandible,i. e; 'gets so enlarged, one or the other way, onwthe'obturating member reaching the endof itsi stroke l on or back) as t'oiprov'ide for an hermetical obturation of the cylindricalfopening, thus preventing any flow offfluid ,through the valve. y'For that purpose, thisobturating piston consistseof two parts which are rigid f" but can slideV yin one another, and between which the Vabove mentioned` expandibleinem-r berl has been inserted thismember-ls a ring which is made of 'any' resilient material and` gets axiallypressed between the two rigid parts whenever the pistonabuts 'against a salient protruding fromthe bottom'ofthe valve body, with the result of getting transversely expandedV and therebygetting tightly n of "example pressed against the whole internal peripheryY of said cylindrical opening of the valve body and providing' for anv hermetical obturationt 1 The accompanying drawings show,1by'way s, Ytwo embodiments of the-inven 'tion,s ay: s y "jr: `Fig.' 1, a view `of the valve being closed and having the'greater part of its mechanism shown inlvertical section, vthe control handle being seen in elevational 4view Fig. 2, is a corresponding view, ona larger scale, of the eliicient portion of its obturating member shapedasa piston; 'l

These two figures refer to a first embodiment of the invention. The remaining views show an example of ytation of a SSOld/Wayof @frying out vtheyilllvention; Y A

a-f middle passage 2' wherein"afcylindrical .v

opening '3 is sov cut .as to-.havesame :axis: as

the bore 4 of the valve, the upp'erfpart thereof being closedby means oflacap ofordinary type wherein vthe obturator 'steml qhas been screwed, saidl piston-shaped obturatorj being capa-ble ofmoving'up and down insidethe bore Vt (whoseextension consists ofthe opening 3) whenever the' control handle keyed upon the valve stem and Vseen :at 8"-is'turned by the operato Q f f v- According to this invention, the obturating Ymember 7 consists of two metal parts' 9 `and 10 whereof the second named (the lower one) willslide inside the iirst namedy as soon as thefobturating member has descended'su'ch ank .amount fas. to cause said-part` to=V strike against a salient 11protrudingffrom-thexbotf tom. ofthe lower 'chamber' of the valve'body 1. F ory the purpose, the .lowery portion f of part9 is-sliaped as afcylindrical `'socket y12 f provided with grooves'13 forsecuring a tight lit;'the upper cylindrical iportion 14of part 10 penetrates into that socket 12, and the parts 10 and'9 are fastened vtogether by means of: dowelpegs 15 .whichare screwed in the cylinder letl and 'can slide linf'lthe holes flof y the socket 12. f

VBetween the-lower edge' ofthis. socket 12 anda. Shoulder 1T of the-part. 10 .there is ya resilient f, ring 18 whose ,diameter is normally equal to.V that ofl the two-rigid. parts, but grows larger as a result of theV transverse expansion Vundergone* byv the ring .on vbeing Y axially pressed Iin Vbetweenthese .two` rigid parts 9 and 10 ofthe obturator.` 'Y f 'The stem 6 isfsecured tothe obturator '7 by v meansof a nut'l9to; be .screwed into the l upper portion .of-,the part 9Vin such .va-'mane neras-tokeep thestem endv 20 quiteenclogsed 1K5 Y havereached the top of its stroke within were unavoidable.

`stem 6 in its rectilinear but not in its rotatory movement; i. e., the stem 6 can-ro- 'tate independently of the obturator 7 while p causing the latter to ascend or descend with it, according to the direction the handwheel is turned in. In the upper portion., oi!Y its stroke, the obturator 7 is guided alongthecylindrical opening o-S ofthe valvebodyvjby means of flaps or wings ,21 protruding from the lower portion of part 10 round a conical portion the latter ends in.

As soon as the obturating member 7 will bore 4 the valve willgive the gas or ether fluid) tree escape and, to regulate the vflow, the operator has but to turn the handwheel 8 Vas' usi-ral, in order that the obturator vmay penetrate-*more or'less into-theopening 3, the fluid lindingits way between the wings 21. On the bottom end ot the obturator abutting against the; salient l1 at the bottom of the valve body `the part 10 will slide into the part 9 and .the pressure thus exerted upon the. resilientxring l8,will cause it to expand in-a transverse direction` and thus heavily` pressiagainstl, the whole internal periphery' off the cylindrical opening e, thereby causing thelatter togetinto so intimate 'a' Contact with Athe dilatable ring as to secure a tight iit, subject to no considerable Ve'iiort of the .operator acting upon his handwheel `8,: and irrespective ofthe pressure of the fluid'in the pipe which leads on tothe valve. H v Y It should be noted that, inthe case of valves designed as usual, serious drawbacks derived from the wear of the parts, these beingfnot worn to an equalextent at all of their points, onaccountof which, to have them rectified and made accurate again, many a grinding, andV many a loss ofV time, fThere-ore, if using the valve designed: according to this invention a great advantage will :derive from its having only onerpart subject to wear; apart which, moreover, can be easily replaced within a few minutes, since the obturating member can be readily taken'oiiby the operator, which hasnot to devote any time to'dealing with the valve body. i e As to the second embodiment, illustrated in Figs. 3, 4 and 5, it is, on the main, similar to the one just described, the'only alteration lying in the provisionv of one or more grooves hollowed out A*of the lupper part of the obturator to give passage to the flow oi gas (or other fluid) squeezed froml the upper portion by the obturator in its upstroke. Such grooves which are indicated at C in Fig. 4t canV be either integrally cast with 'the obturatingmember or ber cut `out' from same ;y

inany case, en this member re'achi'ngfthe top of its stroke the obturation obtained is y suiicient to allow interchangeability of the' packing D subject to no stopping of the valve motion.

.Y Moreover, the obturating action is based upon the same principle as in the first embodiment, andy lies in the pressurezor squeezing of a ringmade of vsome resilient substance thus squeezed between the two telescoping parts of said obturator. At the bot- Vtom end ofthefobturator stroke the obturaascending stroke so as to; drive itrintothe upper part which is rendered-stationaryby the valve cap, thus resulting in a compres; sion of thel resilient ring and in the obtention. of a complete tightness.

An important feature of this Vinvention liesin that it is never necessary to take the valve body oli the piping, since it does not comprise any member requiring interchange A or upkeep.4 'l Y l -v v gv It isobvious vthat the embodiments of the invention` which Vhave been described above, do notI restrict the scope of the invention, which` generallyv speaking comprises all k.of the' modified :forms oiexecution designed after the above stated principle.

I-Iaving thus described and vascertained the subject-matter of my said invention and in what manner thesame is to be performed, I declare that what I claim as ne,w,rand desire to secure by Letters Patent,r is

A valve comprising a body having a cylindrical bore, an obturating member having an upper and lo-werpart movable relative to each other, said upper part being formed withv a hollow cylindrical -bore and communicating side slots, said ,lower part being slidable .in the borefof said upper, a resilient packing between the two parts, whereby In testimony whereof I have aiiiXe-d signature.

i CHARLES SCHMITZ,` 1 

